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Îðèãèíàë: Êàäîìöåâ Á Á «Ñëîæíûå ñèñòåìû — îïåðàöèîííûå ïîäõîäû» ÓÔÍ 160 (7) 163–164 (1990); DOI: 10.3367/UFNr.0160.199007i.0163